CMake: customize step description

Currently, when running "cmakeBuild" the step will only state

Generate build-scripts with cmake and execute them

in the pipeline steps view or stage logs without further specific information. This makes it hard to distinguish multiple cmake calls. It would be helpful to be able to set a custom description (e.g. like "label" in sh-step). Alternatively, the step might show its arguments (steps args would be more helpful than cmakeArgs IMHO) as additional info (I think this is done by argumentsToString() of the StepDescriptor)